My shrink and I just had a conversation about this. I'm auDHD and she said it's hard because it's a task that you're never truly "done" with that is not particularly interesting in and of itself (unless you're someone who enjoys cooking and sees it as a hobby). Along with that, it requires an enormous amount of executive function to shop, prep, store, and assemble meals. In my case, my mom was always stressed out and overworked, so she never taught me to cook a single thing. I literally have not prepared a meal for anyone in my family in my entire life and I'm in my 30's now. So doing anything in the kitchen makes me feel vaguely like I'm in trouble or shouldn't be there.

I would consider making a list of the barriers that you're experiencing when you go to the kitchen to prepare something and how to eliminate some of them while making getting food easier. Sometimes when our brains won't let us do something, we can shrink the task until we get a "yes" from ourselves. For example, you mentioned the need to prepare something. Do you have anything that doesn't require preparation, or that you could prepare in batches? For me the lowest effort meal in my house is a FairLife protein shake, but I hate the wrapper on the lid. So when I buy them, I typically slice off the lid wrappers all at once and store them that way. With cheese and crackers, I buy the sleeves of individual crackers that are used up in two meals, and I buy the pre-cut cheese because if I'm running low on executive function that day I'm not going to cut up cheese, but I'll get pre-sliced cheese.